The classic 40s song has always sounded a bit creepy in it's lyrics and has now been deeded offensive in nature as being a   "rape anthem" with it's it's message. Proponents of the #MeToo movement have pressured radio station across the U.S. in removing the song from the holiday playlist. To someone not familiar with the culture of the forties and the lingo used, it could be construed as a forced interaction between a over zealous man and an innocent young lady as seen below.

Now, applying the climate of today, the lyrics do seem a bit suspect unless you fully understand what was meant. “Hey what’s in this drink” was a stock joke at the time, and the punchline was invariably that there’s actually pretty much nothing in the drink, not even a significant amount of alcohol. 

  See, this woman is staying late, unchaperoned, at a dude’s house. In the 1940’s, that’s the kind of thing Good Girls aren’t supposed to do — and she wants people to think she’s a good girl. The woman in the song says outright, multiple times, that what other people will think of her staying is what she’s really concerned about: “the neighbors might think,” “my maiden aunt’s mind is vicious,” “there’s bound to be talk tomorrow.” 

Obviously she’s having a really great time, and she really wants to stay, and so by excusing her uncharacteristically bold behavior (either to the guy or to herself) is blaming it on the drink — unaware that the drink is actually really weak, maybe not even alcoholic at all. That’s the joke. That is the standard joke that’s going on when a woman in media from the early-to-mid 20th century says “hey, what’s in this drink?” It is not a joke about how she’s drunk and about to be raped. It’s a joke about how she’s perfectly sober and about to have awesome consensual sex and use the drink for plausible deniability . 

  The main theme of the man’s lines in the song is simply offering excuses she can use when people ask later why she spent the night at his house: it was so cold out, there were no cabs available, he simply insisted because he was concerned about my safety in such awful weather. 

  As you see, by the end of the song they are singing in harmony, because they both know what each other want and they've been on the same page all along.